Not to be missed, available worldwide, flexible, informed, convenient, comfortable and VERY good value for money - but the bus was a bit noisy, the commentary a bit too quiet and interspersed with depressing folk music
My wife enjoyed the Cathedral, and the lovely museum of toys. Walking in the old town along Via D'Annunzio. She was impressed by the statue of the Japanese diplomat and the National Museum of Roman Antiques, which is free to enter and whose staff are very kind.